var tabFilter,menu=[],liIndex,curNav,delMenu;
layui.define(["layer","jquery","element"],function(exports){
    var layer = layui.layer,
        $ = layui.jquery,
        element = layui.element,
        layId,
        Tab = function(){
            this.tabConfig = {
                closed : true,
                openTabNum : undefined,  //最大可打开窗口数量
                tabFilter : "bodyTab",  //添加窗口的filter
                url : undefined  //获取菜单json地址
            }
        };

    //获取二级菜单数据
    Tab.prototype.render = function() {
        var url = this.tabConfig.url;
        $.get(url,function(data){
            //显示左侧菜单
            if($(".navBar").html() == ''){
                var _this = this;
                $(".navBar").html(navBar(data)).height($(window).height()-245);
                element.init();  //初始化页面元素
                $(window).resize(function(){
                    $(".navBar").height($(window).height()-245);
                })
            }
        })
    };

    //参数设置
    Tab.prototype.set = function(option) {
        var _this = this;
        $.extend(true, _this.tabConfig, option);
        return _this;
    };

    //通过title获取lay-id
    Tab.prototype.getLayId = function(title){
        $(".layui-tab-title.top_tab li").each(function(){
            if($(this).find("cite").text() == title){
                layId = $(this).attr("lay-id");
            }
        });
        return layId;
    };
    //通过title判断tab是否存在
    Tab.prototype.hasTab = function(title){
        var tabIndex = -1;
        $(".layui-tab-title.top_tab li").each(function(){
            if($(this).find("cite").text() == title){
                tabIndex = 1;
            }
        });
        return tabIndex;
    };

    //右侧内容tab操作
    var tabIdIndex = 0;
    Tab.prototype.tabAdd = function(_this){
        if(window.sessionStorage.getItem("menu")){
            menu = JSON.parse(window.sessionStorage.getItem("menu"));
        }
        var that = this;

        var closed = that.tabConfig.closed,
            openTabNum = that.tabConfig.openTabNum;
        tabFilter = that.tabConfig.tabFilter;
        if(_this.attr("target") == "_blank"){
            window.location.href = _this.attr("data-url");
        }else if(_this.attr("data-url") != undefined){
            var title = '';
            if(_this.find("i.iconfont,i.layui-icon").attr("data-icon") != undefined){
                if(_this.find("i.iconfont").attr("data-icon") != undefined){
                    title += '<i class="iconfont '+_this.find("i.iconfont").attr("data-icon")+'"></i>';
                }else{
                    title += '<i class="layui-icon">'+_this.find("i.layui-icon").attr("data-icon")+'</i>';
                }
            }
            //已打开的窗口中不存在
            if(that.hasTab(_this.find("cite").text()) == -1 && _this.siblings("dl.layui-nav-child").length == 0){
                if($(".layui-tab-title.top_tab li").length == openTabNum){
                    layer.msg('只能同时打开'+openTabNum+'个选项卡哦。不然系统会卡的！');
                    return;
                }
                tabIdIndex++;
                title += '<cite>'+_this.find("cite").text()+'</cite>';
                title += '<i class="layui-icon layui-unselect layui-tab-close" data-id="'+tabIdIndex+'">&#x1006;</i>';
                element.tabAdd(tabFilter, {
                    title : title,
                    content :"<iframe src='"+_this.attr("data-url")+"' data-id='"+tabIdIndex+"'></iframe>",
                    id : new Date().getTime()
                });
                //当前窗口内容
                var curmenu = {
                    "icon" : _this.find("i.iconfont").attr("data-icon")!=undefined ? _this.find("i.iconfont").attr("data-icon") : _this.find("i.layui-icon").attr("data-icon"),
                    "title" : _this.find("cite").text(),
                    "href" : _this.attr("data-url"),
                    "layId" : new Date().getTime()
                };
                menu.push(curmenu);
                window.sessionStorage.setItem("menu",JSON.stringify(menu)); //打开的窗口
                window.sessionStorage.setItem("curmenu",JSON.stringify(curmenu));  //当前的窗口
                element.tabChange(tabFilter, that.getLayId(_this.find("cite").text()));
                that.tabMove(); //顶部窗口是否可滚动
            }else{
                //当前窗口内容
                var curmenu = {
                    "icon" : _this.find("i.iconfont").attr("data-icon")!=undefined ? _this.find("i.iconfont").attr("data-icon") : _this.find("i.layui-icon").attr("data-icon"),
                    "title" : _this.find("cite").text(),
                    "href" : _this.attr("data-url")
                };
                window.sessionStorage.setItem("curmenu",JSON.stringify(curmenu));  //当前的窗口
                element.tabChange(tabFilter, that.getLayId(_this.find("cite").text()));
                that.tabMove(); //顶部窗口是否可滚动
            }
        }
    };

    //顶部窗口移动
    Tab.prototype.tabMove = function(){
        $(window).on("resize",function(){
            var topTabsBox = $("#top_tabs_box"),
                topTabsBoxWidth = $("#top_tabs_box").width(),
                topTabs = $("#top_tabs"),
                topTabsWidth = $("#top_tabs").width(),
                tabLi = topTabs.find("li.layui-this"),
                top_tabs = document.getElementById("top_tabs");
            if(topTabsWidth > topTabsBoxWidth){
                if(tabLi.position().left > topTabsBoxWidth || tabLi.position().left+topTabsBoxWidth > topTabsWidth){
                    topTabs.css("left",topTabsBoxWidth-topTabsWidth);
                }else{
                    topTabs.css("left",-tabLi.position().left);
                }
                //拖动效果
                var flag = false;
                var cur = {
                    x:0,
                    y:0
                };
                var nx,dx,x ;
                function down(){
                    flag = true;
                    var touch ;
                    if(event.touches){
                        touch = event.touches[0];
                    }else {
                        touch = event;
                    }
                    cur.x = touch.clientX;
                    dx = top_tabs.offsetLeft;
                }
                function move(){
                    var self=this;
                    window.getSelection ? window.getSelection().removeAllRanges() : document.selection.empty();
                    if(flag){
                        var touch ;
                        if(event.touches){
                            touch = event.touches[0];
                        }else {
                            touch = event;
                        }
                        nx = touch.clientX - cur.x;
                        x = dx+nx;
                        if(x > 0){
                            x = 0;
                        }else{
                            if(x < topTabsBoxWidth-topTabsWidth){
                                x = topTabsBoxWidth-topTabsWidth;
                            }else{
                                x = dx+nx;
                            }
                        }
                        top_tabs.style.left = x +"px";
                        //阻止页面的滑动默认事件
                        document.addEventListener("touchmove",function(){
                            event.preventDefault();
                        },false);
                    }
                }
                //鼠标释放时候的函数
                function end(){
                    flag = false;
                }
                //pc端拖动效果
                topTabs.on("mousedown",down);
                topTabs.on("mousemove",move);
                $(document).on("mouseup",end);
                //移动端拖动效果
                topTabs.on("touchstart",down);
                topTabs.on("touchmove",move);
                topTabs.on("touchend",end);
            }else{
                //移除pc端拖动效果
                topTabs.off("mousedown",down);
                topTabs.off("mousemove",move);
                topTabs.off("mouseup",end);
                //移除移动端拖动效果
                topTabs.off("touchstart",down);
                topTabs.off("touchmove",move);
                topTabs.off("touchend",end);
                topTabs.removeAttr("style");
                return false;
            }
        }).resize();
    };

    $("body").on("click",".top_tab li",function(){
        //切换后获取当前窗口的内容
        var curmenu = '';
        var menu = JSON.parse(window.sessionStorage.getItem("menu"));
        curmenu = menu[$(this).index()-1];
        if($(this).index() == 0){
            window.sessionStorage.setItem("curmenu",'');
        }else{
            window.sessionStorage.setItem("curmenu",JSON.stringify(curmenu));
            if(window.sessionStorage.getItem("curmenu") == "undefined"){
                //如果删除的不是当前选中的tab,则将curmenu设置成当前选中的tab
                if(curNav != JSON.stringify(delMenu)){
                    window.sessionStorage.setItem("curmenu",curNav);
                }else{
                    window.sessionStorage.setItem("curmenu",JSON.stringify(menu[liIndex-1]));
                }
            }
        }
        element.tabChange(tabFilter,$(this).attr("lay-id")).init();
        // new Tab().tabMove();
    });

    //删除tab
    $("body").on("click",".top_tab li i.layui-tab-close",function(){
        //删除tab后重置session中的menu和curmenu
        liIndex = $(this).parent("li").index();
        var menu = JSON.parse(window.sessionStorage.getItem("menu"));
        //获取被删除元素
        delMenu = menu[liIndex-1];
        var curmenu = window.sessionStorage.getItem("curmenu")=="undefined" ? undefined : window.sessionStorage.getItem("curmenu")=="" ? '' : JSON.parse(window.sessionStorage.getItem("curmenu"));
        if(JSON.stringify(curmenu) != JSON.stringify(menu[liIndex-1])){  //如果删除的不是当前选中的tab
            // window.sessionStorage.setItem("curmenu",JSON.stringify(curmenu));
            curNav = JSON.stringify(curmenu);
        }else{
            if($(this).parent("li").length > liIndex){
                window.sessionStorage.setItem("curmenu",curmenu);
                curNav = curmenu;
            }else{
                window.sessionStorage.setItem("curmenu",JSON.stringify(menu[liIndex-1]));
                curNav = JSON.stringify(menu[liIndex-1]);
            }
        }
        menu.splice((liIndex-1), 1);
        window.sessionStorage.setItem("menu",JSON.stringify(menu));
        element.tabDelete("bodyTab",$(this).parent("li").attr("lay-id")).init();
        new Tab().tabMove();
    });

    var bodyTab = new Tab();
    exports("bodyTab",function(option){
        return bodyTab.set(option);
    });
});